M6 tolerance (hole, IT6)
Hole tolerance class M6 per ISO 286-1:2010: fundamental deviation ES −2 … −10, grade IT6 (6 µm at ≤ 3 mm to 40 µm at 400–500 mm). For an exact size, open the calculator with M6 selected.
- Type
- Hole
- Grade
- IT6
- Tolerance
- 6 … 40 µm
- Fund. deviation
- ES −2 … −10 µm
M6 limits by size range
| Size (mm) | Upper (µm) | Lower (µm) | Ø max (mm) | Ø min (mm) | Upper (mm) | Lower (mm) | Dev. (in) |
|---|---|---|---|---|---|---|---|
| ≤ 3 | −2 | −8 | 2.998 | 2.992 | −0.002 | −0.008 | −0.00008 / −0.00031 |
| 3 – 6 | −1 | −9 | 5.999 | 5.991 | −0.001 | −0.009 | −0.00004 / −0.00035 |
| 6 – 10 | −3 | −12 | 9.997 | 9.988 | −0.003 | −0.012 | −0.00012 / −0.00047 |
| 10 – 14 | −4 | −15 | 13.996 | 13.985 | −0.004 | −0.015 | −0.00016 / −0.00059 |
| 14 – 18 | −4 | −15 | 17.996 | 17.985 | −0.004 | −0.015 | −0.00016 / −0.00059 |
| 18 – 24 | −4 | −17 | 23.996 | 23.983 | −0.004 | −0.017 | −0.00016 / −0.00067 |
| 24 – 30 | −4 | −17 | 29.996 | 29.983 | −0.004 | −0.017 | −0.00016 / −0.00067 |
| 30 – 40 | −4 | −20 | 39.996 | 39.980 | −0.004 | −0.020 | −0.00016 / −0.00079 |
| 40 – 50 | −4 | −20 | 49.996 | 49.980 | −0.004 | −0.020 | −0.00016 / −0.00079 |
| 50 – 65 | −5 | −24 | 64.995 | 64.976 | −0.005 | −0.024 | −0.00020 / −0.00094 |
| 65 – 80 | −5 | −24 | 79.995 | 79.976 | −0.005 | −0.024 | −0.00020 / −0.00094 |
| 80 – 100 | −6 | −28 | 99.994 | 99.972 | −0.006 | −0.028 | −0.00024 / −0.00110 |
| 100 – 120 | −6 | −28 | 119.994 | 119.972 | −0.006 | −0.028 | −0.00024 / −0.00110 |
| 120 – 140 | −8 | −33 | 139.992 | 139.967 | −0.008 | −0.033 | −0.00031 / −0.00130 |
| 140 – 160 | −8 | −33 | 159.992 | 159.967 | −0.008 | −0.033 | −0.00031 / −0.00130 |
| 160 – 180 | −8 | −33 | 179.992 | 179.967 | −0.008 | −0.033 | −0.00031 / −0.00130 |
| 180 – 200 | −8 | −37 | 199.992 | 199.963 | −0.008 | −0.037 | −0.00031 / −0.00146 |
| 200 – 225 | −8 | −37 | 224.992 | 224.963 | −0.008 | −0.037 | −0.00031 / −0.00146 |
| 225 – 250 | −8 | −37 | 249.992 | 249.963 | −0.008 | −0.037 | −0.00031 / −0.00146 |
| 250 – 280 | −9 | −41 | 279.991 | 279.959 | −0.009 | −0.041 | −0.00035 / −0.00161 |
| 280 – 315 | −9 | −41 | 314.991 | 314.959 | −0.009 | −0.041 | −0.00035 / −0.00161 |
| 315 – 355 | −10 | −46 | 354.990 | 354.954 | −0.010 | −0.046 | −0.00039 / −0.00181 |
| 355 – 400 | −10 | −46 | 399.990 | 399.954 | −0.010 | −0.046 | −0.00039 / −0.00181 |
| 400 – 450 | −10 | −50 | 449.990 | 449.950 | −0.010 | −0.050 | −0.00039 / −0.00197 |
| 450 – 500 | −10 | −50 | 499.990 | 499.950 | −0.010 | −0.050 | −0.00039 / −0.00197 |
Deviations at the upper end of each range (Ø columns use that size); use the calculator for the exact size. — : not defined by ISO 286 for that size. Upper/Lower (mm) and inch columns are shown on wider screens.
About M6
M6 denotes a hole tolerance zone with tight transition deviation in the ISO 286 system. It is used in M6/h5 (Shaft-basis equivalent of H6/m5; a light press fit on a precision shaft for parts that must not shift, common where several components share one ground shaft.).
At Ø25 mm M6 is −0.004 / −0.017 mm, i.e. 24.983 to 24.996 mm.
How the limits are calculated
M6 uses grade IT6 (a standard tolerance of 13 µm at 18–30 mm). Fundamental deviation: ES = −ei + Δ (Δ = ITn − IT(n−1), applied up to IT8 for K/M/N and IT7 otherwise); IT6 sets the width below ES. See the fundamental deviation table for every letter. Values per ISO 286-1:2010.